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MXene Hybridized Polymer with Enhanced Electromagnetic Energy Harvest for Sensitized Microwave Actuation and Self‑Powered Motion Sensing

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nano-Micro Letters 2025年第3期17卷 265-279页

作者： yu‑ze Wang yu‑Chang Wang Ting‑Ting Liu Quan‑Liang Zhao Chen‑Sha Li Mao‑Sheng Cao School of Materials Science and Engineering Beijing Institute of TechnologyBeijing 100081People’s Republic of China School of Materials Science and Engineering Peking UniversityBeijing 100871People’s Republic of China School of Mechanical and Material Engineering North China University of TechnologyBeijing 100144People’s Republic of China Key Laboratory of Functional Inorganic Material Chemistry Ministry of Education of the People’s Republic of ChinaHeilongjiang UniversityHarbin 150080People’s Republic of China

Polymeric microwave actuators combining tissue-like softness with programmablemicrowave-responsive deformation hold great promise for mobile intelligentdevices and bionic soft robots. However, their application is challenged by restricted electromagneticsensitivity and intricate sensing coupling. In this study, a sensitized polymericmicrowave actuator is fabricated by hybridizing a liquid crystal polymer with Ti3C2Tx(MXene). Compared to the initial counterpart, the hybrid polymer exhibits unique spacechargepolarization and interfacial polarization, resulting in significant improvements of230% in the dielectric loss factor and 830% in the apparent efficiency of electromagneticenergy harvest. The sensitized microwave actuation demonstrates as the shortenedresponse time of nearly 10 s, which is merely 13% of that for the initial shape memory polymer. Moreover, the ultra-low content of MXene (upto 0.15 wt%) benefits for maintaining the actuation potential of the hybrid polymer. An innovative self-powered sensing prototype that combinesdriving and piezoelectric polymers is developed, which generates real-time electric potential feedback (open-circuit potential of ~ 3 mV) duringactuation. The polarization-dominant energy conversion mechanism observed in the MXene-polymer hybrid structure furnishes a new approachfor developing efficient electromagnetic dissipative structures and shows potential for advancing polymeric electromagnetic intelligent devices.

关键词： Microwave absorption Electromagnetic response Energy harvest Self-sensing Soft actuator

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Application of a Feedback Journal Club

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Chinese Medical Journal 2017年第22期130卷 2752-2754页

作者： nan-ze yu Pan-Xi yu Xiao-Jun Wang Xiao Long Elan Yang Jiu-Zuo Huang Yang Wang Wei-Ming Kang Ying-Zi Jiang Kang Li Jun Zhao Hui Pan Department of Plastic Surgery Peking Union Medical College Hospital Chinese Academy of Medical Sciences and Peking Union Medical College Beijing 100730 China The 16th Department Plastic Surgery Hospital Chinese Academy of Medical Sciences and Peking Union Medical CQIlege Beijing 100144 China Department of General Surgery Peking Union Medical College Hospital Chinese Academy of Medical Sciences and Peking Union Medical College Beijing 100730 China Department of Education Peking Union Medical College Hospital Chinese Academy of Medical Sciences and Peking Union Medical College Beijing 100730 China Department of Endocrinology Peking Union Medical College Hospital Chinese Academy of Medical Sciences and Peking Union Medical College Beijing 100730 China

The first documented journal club was organized in 1875 by William Osler at McGill University, to keep staff informed of medical science in a cost-effective manner. Nowadays, journal club has already become a common form of interactive education in hope to keep medical practitioners up-to-date of current literature, understand research design and statistics, and expand critical appraisal skills. A considerable amount of literatures describing journal clubs in different forms have been published; most were to enhance students＇ critical thinking, research competency,

关键词： Feedback Journal Club Publication

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Chinese medical students’interest in COVID-19 pandemic

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World Journal of Virology 2020年第3期9卷 38-46页

作者： nan-ze yu Zhi-Jin Li yu-Ming Chong yuan Xu Jun-Ping Fan Yang Yang yue Teng yu-Wei Zhang Wen-Chao Zhang Ming-Zi Zhang Jiu-Zuo Huang Xiao-Jun Wang Shu-Yang Zhang Xiao Long Department of Plastic Surgery Peking Union Medical College HospitalChinese Academy of Medical Sciences and Peking Union Medical CollegeBeijing 100730China Department of Thoracic Surgery Peking Union Medical College HospitalChinese Academy of Medical Sciences and Peking Union Medical CollegeBeijing 100730China Department of Pulmonary and Critical Care Medicine Peking Union Medical College HospitalChinese Academy of Medical Sciences and Peking Union Medical CollegeBeijing 100730China Department of Orthopaedics Peking Union Medical College HospitalChinese Academy of Medical Sciences and Peking Union Medical CollegeBeijing 100730China Department of Cardiology Peking Union Medical College HospitalChinese Academy of Medical Sciences and Peking Union Medical CollegeBeijing 100730China

BACKGROUND The outbreak of coronavirus disease 2019(COVID-19)happened in early December and it has affected China in more ways than *** societal response to the pandemic restricted medical students to their *** students cannot learn about COVID-19 through clinical practice,they can still pay attention to news of COVID-19 through various ***,as suggested by previous studies,some medical students have already volunteered to serve during the COVID-19 pandemic,the overall willingness of Chinese medical students to volunteer for such has not been systematically *** To study Chinese medical students’interest in the relevant knowledge on COVID-19 and what roles they want to play in the *** Medical students at Peking Union Medical College were surveyed via a webbased questionnaire to obtain data on the extent of interest in the relevant knowledge on COVID-19,attitude towards volunteerism in the pandemic,and career *** regression modeling was used to investigate possible factors that could encourage volunteerism among this group in a *** A total of 552 medical students *** medical students showed a huge interest in *** extent of students’interest in COVID-19 varied among different student-classes(P<0.05).Senior students had higher scores than the other two *** number of people who were‘glad to volunteer’in COVID-19 represented 85.6%of the *** these students expressed willingness to undertake involved direct,indirect,and administrative job *** regression analysis identified two factors that negatively influenced volunteering in the pandemic:Student-class and hazards of the voluntary *** that positively influenced volunteering were time to watch COVID-19 news,predictable impact on China,and moral *** More innovative methods can be explored to increase Chinese medical students’interest in reading about the relevan

关键词： COVID-19 Chinese medical students Volunteer Medical education Public health emergency of international concern

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基于数值模拟的双感应测井裂缝参数定量评价方法

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地球物理学进展 2017年第2期32卷 696-701页

作者：南泽宇李军刘志远张军中国石化股份有限公司石油勘探开发研究院北京100083

为厘清裂缝性地层双感应测井响应特征,建立裂缝参数评价方法,本文建立了含基岩、裂缝、井眼、双感应测井仪器的裂缝性地层双感应测井正演模型,以Gianzero几何因子理论为基础,结合阿特拉斯公司1503双感应测井仪器开展了高阻背景下低阻裂... 详细信息

为厘清裂缝性地层双感应测井响应特征,建立裂缝参数评价方法,本文建立了含基岩、裂缝、井眼、双感应测井仪器的裂缝性地层双感应测井正演模型,以Gianzero几何因子理论为基础,结合阿特拉斯公司1503双感应测井仪器开展了高阻背景下低阻裂缝测井响应数值模拟.首先计算了1503双感应测井仪器几何因子,然后根据该几何因子求解不同裂缝开度、裂缝充填流体电导率、基岩电导率条件下双感应测井响应特征,分析了裂缝开度、裂缝充填流体电导率、基岩电导率对双感应测井响应的影响,归纳了裂缝性地层双感应测井响应规律.采用深感应视电阻率及深、中感应视电阻率比值作为横纵坐标,结合裂缝充填流体电阻率绘制了一套双感应裂缝开度评价图版.通过对图版数据进行拟合,建立了裂缝开度评价模型.在采用岩心、成像资料对评价模型刻度以减小几何因子理论计算非均质裂缝产生的误差后该模型可用于求取裂缝参数.最后将该方法应用于镇泾油田致密砂岩裂缝性储层进行裂缝参数定量评价,评价结果与成像测井评价结果吻合较好.

关键词：双感应测井裂缝评价图版法数值模拟

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Hypoxia-preconditioned bone marrow-derived mesenchymal stem cells protect neurons from cardiac arrest-induced pyroptosis

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Neural Regeneration Research 2025年第4期20卷 1103-1123页

作者： Xiahong Tang nan Zheng Qingming Lin Yan You Zheng Gong Yangping Zhuang Jiali Wu yu Wang Hanlin Huang Jun Ke Feng Chen Shengli Clinical Medical College of Fujian Medical University Fujian Medical UniversityFuzhouFujian ProvinceChina Department of Emergency Fujian Provincial HospitalFuzhouFujian ProvinceChina Fujian Provincial Key Laboratory of Emergency Medicine FuzhouFujian ProvinceChina The Second Department of Intensive Care Unit Fujian Provincial Hospital South BranchFuzhouFujian ProvinceChina

Cardiac arrest can lead to severe neurological impairment as a result of inflammation,mitochondrial dysfunction,and post-cardiopulmonary resuscitation neurological *** preconditioning has been shown to improve migration and survival of bone marrow–derived mesenchymal stem cells and reduce pyroptosis after cardiac arrest,but the specific mechanisms by which hypoxia-preconditioned bone marrow–derived mesenchymal stem cells protect against brain injury after cardiac arrest are *** this end,we established an in vitro co-culture model of bone marrow–derived mesenchymal stem cells and oxygen–glucose deprived primary neurons and found that hypoxic preconditioning enhanced the protective effect of bone marrow stromal stem cells against neuronal pyroptosis,possibly through inhibition of the MAPK and nuclear factor κB ***,we transplanted hypoxia-preconditioned bone marrow–derived mesenchymal stem cells into the lateral ventricle after the return of spontaneous circulation in an 8-minute cardiac arrest rat model induced by *** results showed that hypoxia-preconditioned bone marrow–derived mesenchymal stem cells significantly reduced cardiac arrest–induced neuronal pyroptosis,oxidative stress,and mitochondrial damage,whereas knockdown of the liver isoform of phosphofructokinase in bone marrow–derived mesenchymal stem cells inhibited these *** conclude,hypoxia-preconditioned bone marrow–derived mesenchymal stem cells offer a promising therapeutic approach for neuronal injury following cardiac arrest,and their beneficial effects are potentially associated with increased expression of the liver isoform of phosphofructokinase following hypoxic preconditioning.

关键词： bone marrow–derived mesenchymal stem cells cardiac arrest cardiac resuscitation hypoxic preconditioning liver isoform of phosphofructokinase mitochondria neuroinflammation oxidative stress pyroptosis reactive oxygen species

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元坝须三段致密含钙砂砾岩地层测井响应特征及岩性识别方法

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科学技术与工程 2021年第3期21卷 969-978页

作者：南泽宇谭茂金张延华肖开华刘志远中国地质大学(北京)地球物理与信息技术学院北京100083 中国石化石油勘探开发研究院北京100083 中国石油股份有限公司青海油田分公司勘探开发研究院敦煌736200

致密含钙砂砾岩地层岩石类型多样,含钙屑砂岩、岩屑砂岩、炭质砂岩、砂砾岩等,然而含钙砂砾岩地层不同岩石类型测井响应差异小、识别难,岩性识别成为制约该类储层有效勘探开发的关键。以多级交会图为手段,详细分析各岩石类型测井响应特... 详细信息

致密含钙砂砾岩地层岩石类型多样,含钙屑砂岩、岩屑砂岩、炭质砂岩、砂砾岩等,然而含钙砂砾岩地层不同岩石类型测井响应差异小、识别难,岩性识别成为制约该类储层有效勘探开发的关键。以多级交会图为手段,详细分析各岩石类型测井响应特征及差异的内在成因,确定各岩石类型在测井交会图上的分布区间,实现岩性逐级判别。首先将含钙砂砾岩地层岩性分为煤、泥岩、砾岩、砂岩四大类,采用电阻率、伽马等测井方法识别四大类岩性;然后,根据砾石含量将砾岩分为含砂砾岩、砂质砾岩两小类,采用电阻率、中子等测井方法对砾岩进行细分;接着,根据组分及粒度将砂岩划分为炭质砂岩、中-粗粒钙屑砂岩、细粒钙屑砂岩、钙屑粉砂岩-常规岩屑砂岩四小类,采用电阻率、伽马等测井方法对砂岩进行细分;最终实现基于多级交会图的含钙致密砂砾岩地层四大类八小类岩性识别,识别结果与岩心、薄片吻合较好。该方法为明确致密含钙砂砾岩地层各类岩性测井响应特征、建立岩性剖面及确定有利储层展布提供了依据。

关键词：钙屑砂岩砂砾岩交会图岩性识别元坝须三段

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[Advances in molecular networking technology for discovering emerging contaminants and transformation products]

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Se pu = Chinese journal of chromatography 2025年第1期43卷 33-42页

作者： Xiao-Mei Tan yu-Wei Zhang Zhao-yu Jiao nan-Yang yu Si Wei State Key Laboratory of Pollution Control & Resource Reuse School of Environment Nanjing University Nanjing 210046 China.

Emerging contaminants and their transformation products are widely distributed in the environment. These pollutants carry unknown risks owing to their persistence, migration, and toxicity. The wide variety and complex structures of these substances render them difficult to identify using only target analysis. Suspect screening analysis can identify more substances than target analysis in a single run. However, this analysis method is based on limited data and cannot meet the growing demand for compound identification, especially for emerging contaminants and their transformation products with unknown information. The development of high-resolution mass spectrometry technology has promoted the applications of nontarget analysis in the environmental field, especially for identifying unknown transformation products. At present, the challenges of nontarget analysis include the difficulty of finding compounds of interest and their transformation products from complex data. Molecular networking calculates the similarity between mass spectra based on an improved cosine similarity algorithm. This method can cluster molecular families with similar structures, achieve visualization and a collection of massive mass spectral datasets, and promote the annotation of pollutants through networks and communities. Molecular networking can globally organize and systematically interpret complex tandem mass spectral datasets, providing a new direction for nontarget analysis. This technology was first used in proteomics and gradually introduced into metabolomics for the discovery of new natural products. Recently, it has been introduced into the environmental field for the study of various man-made chemicals, particularly for the discovery of emerging contaminants and their transformation products. In this paper, we introduce a molecular networking analysis method based on high-resolution tandem mass spectrometry and describe its applications in the nontargeted screening of emerging cont

关键词： emerging contaminants high-resolution tandem mass spectrometry molecular networking transformation products

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福州市鼓楼区楼宇经济的空间分布

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亚热带资源与环境学报 2015年第4期10卷 50-57页

作者：宁婷韦素琼陈嘉林泽楠余增涛福建师范大学地理研究所福州350007 福建师范大学地理科学学院福州350007 福建师范大学湿润亚热带生态地理过程教育部重点实验室福州350007

楼宇经济是新型城镇化建设和城市可持续发展的重要内容。研究基于福州市鼓楼区楼宇经济办公室、"楼宇之窗"网站和实地调研所得数据,从楼宇分布和行业分布两方面,对福州楼宇经济空间分布进行分析,发现鼓楼区楼宇经济呈现"东南热,西北冷"... 详细信息

楼宇经济是新型城镇化建设和城市可持续发展的重要内容。研究基于福州市鼓楼区楼宇经济办公室、"楼宇之窗"网站和实地调研所得数据,从楼宇分布和行业分布两方面,对福州楼宇经济空间分布进行分析,发现鼓楼区楼宇经济呈现"东南热,西北冷"的不均衡发展态势。以楼宇为单位,对楼宇经济效益与楼宇质量的相关性进行分析,结果显示:地理区位、楼宇规模、楼宇管理水平、硬件配套设施、产业集聚水平等因素与楼宇经济效益存在显著相关性,而鼓楼区在这些方面存在"一小一散三低"的问题。针对鼓楼区楼宇经济建设过程中存在的问题,提出针对性的意见和建议,为其楼宇经济的进一步发展提供科学依据。

关键词：楼宇经济空间分布影响因素相关性鼓楼区

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Black ring entropy from the Weyl tensor

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Frontiers of physics 2018年第5期13卷 221-230页

作者： ze-Wei Zhao Chun-Kai yu nan Li Department of Physics College of Sciences Northeastern University Shenyang 110819 China Department of Modern Physics University of Science and Technology of China Hefei 230026 China

A black ring is an asymptotically fiat vacuum solution of the n-dimensional Einstein equations with an event horizon of topology S1× Sn-3. In this study, a connection between the black ring entropy and the Weyl tensor Cμνλρ is explored by interpreting the Weyl scalar invariant CμνλρCμνλρ as the entropy density in five-dimensional space-time. It is shown that the proper volume integral of CμνλρCμνλρfor a neutral black ring is proportional to the black ring entropy in the thin-ring limit. Similar calculations are extended to more general cases： a black string, a black ring with two angular momenta, and a black ring with a cosmological constant. The proportionality is also found to be valid for these complex black objects at the leading order.

关键词： black ring Weyl tensor entropy Penrose conjecture

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一种多模式轮腿移动机器人的设计与分析

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天津大学学报（自然科学与工程技术版） 2025年第1期58卷 12-23页

作者：李晋馥于泽连宾宾天津大学机构理论与装备设计教育部重点实验室天津300350

移动机器人作为智能勘探与侦察的自动化装备,在航天探测、抢险救灾等领域具有广阔的应用前景.轮腿式移动机器人因具有良好的机动性与越障能力而受到青睐.然而现有轮腿式移动机器人机身大多不可变形,导致机器人运动模式较少,地形适应性一... 详细信息

移动机器人作为智能勘探与侦察的自动化装备,在航天探测、抢险救灾等领域具有广阔的应用前景.轮腿式移动机器人因具有良好的机动性与越障能力而受到青睐.然而现有轮腿式移动机器人机身大多不可变形,导致机器人运动模式较少,地形适应性一般.且机身易与障碍物发生碰撞,无法在具备良好的爬坡能力的同时保证跨越障碍物的效率.针对上述问题,本文提出了一种采用多连杆可变形机构作为机身的轮腿式移动机器人.在设计机器人轮腿及可变形机身的基础上,建立机器人整体运动学模型,据此规划机器人3种运动模式:同步步态、翻滚步态和蜷曲-伸展步态.开展机器人在典型地形(平坦地面、松软地形、上升坡度、下降坡度、障碍物)下的运动性能分析,揭示机器人结构参数与地形特征(爬坡角度、障碍物高度)映射关系.最后基于理论分析结果搭建物理样机并开展实验.实验结果表明,本文所设计的多模式轮腿移动机器人的最大爬坡角度和越障高度分别为44°和28 mm,具有良好的爬坡能力与越障性能.此外,得益于多模式运动特点,机器人在包含平坦地面及松软地形在内的多地形下均具有良好的通过性,验证了机器人方案的可行性.本文为多模式轮腿运动机器人的设计与应用提供有益参考.

关键词：多模式移动机器人轮腿式移动机器人运动学建模实验研究

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